1987 TOYOTA CELICA Service Repair Manual

EFI SYSTEM - Electronic Control System FI-111
Location of Electronic- Coritrol Parts (Cont’d)
LHD
RHO
EFI Main Relay
Fuel Pump Relay
Check Connector’
Cold Start lniector
Water Tern;. Switch
VSV (for FPU) >id Resistor
Check/Cohor
/ I Circuit Opening R?l?y,Y
Cold Start Injector
Time Switch
Water Tern;
Switch Resistor
Fuel Pump Solenoid Resistor
I4 yw
VSV (for FPU)
Solenoih Resistor
Fl28
FIZ I19 I 120

12 EFI SYSTEM - Electronic Control Svstem
EFI Main Relay
. .
Fusible Link EFI Main Relay
AM2 30A
(MA)
Fusible (MA) MAIN 2.OL
Link
Ig (MS) MAIN l.OY ECU
.
FBI (Bi)
tB (B)
M-REL
El
Jo continuity Continuity
INSPECTION OF EFI MAIN RELAY
n Inl
r-----x n i?d 1. INSPECT RELAY CONTINUITY
(a) Using an ohmmeter, check that there is continuity
between terminals 1 and 3:
(b) Check that there is no continuity between terminals 2
and 4.
‘3 BE0009
Continuity
Battery 2.
If continuity is not as specified, replace the relay.
INSPECT RELAY OPERATION
(a) Apply battery voltage across terminals 1 and 3.
(b) Check that there is continuity between terminals 2
and 4.
If operation is not as specified, replace the relay.

EFI SYSTEM - Electronic Control System
FI-113
hrcuit Opening Relay
._
Check Connector
Fuel Pump Switch
(Air Flow Meter)
-. To Fuel Pump
Relay
I
I r-l ~1 Continuity ’ INSPECTION OF CIRCUIT OPENING RELAY
i-----E
1.
INSPECT RELAY CONTINUITY
(a) Using an ohmmeter, check that there is continuity
between terminals STA and El.
(b) Check that there is continuity between terminals B
and FC.
(c) Check that there is no continuity between terminals B
and FP.
If continuity is not as specified, replace the relay.
2.
INSPECT RELAY OPERATION
(a) Apply battery voltage across terminals STA and El.
(b) Using an ohmmeter, check that there is continuity
between terminals B and FP.
(c) Apply battery voltage across terminals B and FC.
(d) Check that there is continuity between terminals B
and FP.
If operation is not as specified, replace the relay.

-114 EFI SYSTEM - Electronic Control Sistem 7.
Solenoid Resistor
. .
ECU
G S/W
No. 10
No. 20
No. 30
EOl
E02
1 INSPECTION OF SOLENOID RESISTOR
INSPECT RESISTANCE OF SOLENOID RESISTOR
Using an ohmmeter, measure the resistance between +B
and other terminals.
Resistance: 3 n each
If the resistance is not as specified, replace the resistor.
No.‘20 Nci. 30
l=l257~

EFI SYSTEM
- Electronic Co?troi System
FI-116
To ignition Switch
(ST11
1 To ECU (STA)
-- : Cold Start Injector Time Switch
._
To ECi
Time Switch
FH37
INSPECTION OF COLD START INJECTOR
TIME SWITCH
1. INSPECT RESISTANCE OF COLD START INJECTOR
TIME SWITCH
(a) Disconnect the connector.
(b) Using an ohmmeter, measure the resistance between
each terminal.
Resistance:
w/ TWC
STA - STJ
25 - 50 Cl below
15°C (59°F)
60 - 85 Cl above
30~ (860~)
STA - Ground 25 - 85 Q
w/o TWC
STA - STJ
20 - 40 n below
30°C (86OFI
40 - 60 i2 above
40°C (104’FI
STA - Ground 20 - 80 $I
If the resistance is not as specified, replace the switch.
2.
IF NECESSARY, REPLACE COLD START INJECTlbN
TIME SWITCH
(a) Drain the coolant.
(b) Using SST, replace the switch with a new gasket.
SST 09814-20010
Torque: 300 kg-cm (22 f&lb, 29 Narn)
(cl Refill with coolant.

FL1 16 EFI SYSTEM - Electronic Con’trol System
Water Temperature Sensor
._
WATER TEMP. SENSOR
I Thermistor
, I I I I
I -20 0 20 40 60 80 100 120
(-4) (32) (68)(104)(140)1176)(212) (248)
TEMPERATURE “C IoF)
Fl0516FiO7C
INSPECTION OF WATER TEMPERATURE
SENSOR
INSPECT RESISTANCE OF WATER TEMPERATURE
SENSOR
Using an ohmmeter, measure the resistance between both
terminals.
Resistance: Refer to chart.
If the.resistance is not as specified, replace the water tem-
perature sensor.

EFI SYSTEM - Electronic Control System
FI-117
Fuel Pump Relay and Resistor
To Circuit Opning *-
Relay (FP)
+B
Fuel Pump Relay
M Fuel Pump
P Y
Fit 70
I No continuity
MS Continuitv Continuity I
N
R25
am
IA
Continuitv
FI:
VIA
Continuity Continuity INSPECTION OF PUMP RELAY AND
RESISTOR
1.
A. INSPECT FUEL PUMP RELAY
Inspect Relay Continuity
(a) Using an ohmmeter, check that there is continuity
between terminals +B and FP.
(b) Check that there is continuity between terminals +B
and FPR.
(c) Check that there is no continuity between terminals
+B and PR.
If continuity is not as specified, replace the relay.
B. Inspect Relay Operation
la) Apply battery voltage across terminals +B and FPR.
(b) Using an ohmmeter, check that there is continuity
between terminals +B and PR.
(c) Check that there
is no continuity between terminals
B and FP.
If operation is not as described, replace the relay.

EFI SVSTEM - Electronic Coqtrol System
-.
_
’ No continuity I
2. INSPECT FUEL PUMP RESISTOR
inspect Resistance of Fuel Pump Resistor
Using an ohmmeter;mea&e the resistance between both
terminals.
Resistance: Approx. 0.7 a
If the resistance is not as specified, replace the fuel pump
resistor.
. .